1021220222121 has 12 divisors (see below), whose sum is σ = 1609195501680. Its totient is φ = 618921346680.

The previous prime is 1021220222111. The next prime is 1021220222123. The reversal of 1021220222121 is 1212220221201.

It is a happy number.

1021220222121 is a `hidden beast` number, since 10 + 212 + 202 + 221 + 21 = 666.

It is not a de Polignac number, because 1021220222121 - 2¹⁹ = 1021219697833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021220222094 and 1021220222103.

It is not an unprimeable number, because it can be changed into a prime (1021220222123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5157677791 + ... + 5157677988.

It is an arithmetic number, because the mean of its divisors is an integer number (134099625140).

Almost surely, 2^{1021220222121} is an apocalyptic number.

1021220222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021220222121 is a deficient number, since it is larger than the sum of its proper divisors (587975279559).

1021220222121 is a wasteful number, since it uses less digits than its factorization.

1021220222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10315355796 (or 10315355793 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1021220222121 its reverse (1212220221201), we get a palindrome (2233440443322).

The spelling of 1021220222121 in words is "one trillion, twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".